Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 


206 posts

Master Geek
+1 received by user: 1


  Reply # 531515 10-Oct-2011 14:00 Send private message

Well Saturday on the roof.

It was a bit windy - at least it wasn't wet!

Took the tools up there and a can of CRC.

Tightened the F plug where it was connected to the in built diplexer and noticed the F socket was turning itself.

Opened up the diplexer and saw that the socket turning had caused the wires to twist and one had broken it's solder join from the socket.

Disassembled it and took it down to the workshop for a re-solder.

Re-installed and did the obligatory CRC spray over everything (it was windy).

Result:

Now have a high signal on all MUX. Will check it out again tonight (Monday) as another storm is forecasted.

I have a Sony TV and have some interesting signal stats that I would like to understand:

For each channel you get a Pre Viberbi reading, a 5s reading a UEC and a COFDM AGC reading. There is also a Post Viberbi reading and a post 5s reading.

For all MUX the 'post' readings were all zero. I assume this is something to do with measuring the errors post the decryption process - so I guess zero is good.

The UEC reading in all cases was zero.

The COFDM AGC reading ranged from -480 to -500 across the three MUX.

The Pre Viberbi reading on TVNZ was 1.25 e-4 sometimes hiting 8.3 e-5. The 5s was 1.06 e-4 sometimes 9 e-5.

On Mediaworks the Pre V was 1.7 e-4 and 5s 1.7 e-4.

On Kordia the Pre V was 1.2 e-4 sometimes 8 e-5 and the 5s was 1.01 e-4.

What does all this mean?

527 posts

Ultimate Geek
+1 received by user: 9


  Reply # 531569 10-Oct-2011 16:01

steve2222: Well Saturday on the roof.

It was a bit windy - at least it wasn't wet!

Took the tools up there and a can of CRC.

Tightened the F plug where it was connected to the in built diplexer and noticed the F socket was turning itself.

Opened up the diplexer and saw that the socket turning had caused the wires to twist and one had broken it's solder join from the socket.

Disassembled it and took it down to the workshop for a re-solder.

Re-installed and did the obligatory CRC spray over everything (it was windy).

Result:

Now have a high signal on all MUX. Will check it out again tonight (Monday) as another storm is forecasted.

I have a Sony TV and have some interesting signal stats that I would like to understand:

For each channel you get a Pre Viberbi reading, a 5s reading a UEC and a COFDM AGC reading. There is also a Post Viberbi reading and a post 5s reading.

For all MUX the 'post' readings were all zero. I assume this is something to do with measuring the errors post the decryption process - so I guess zero is good.

The UEC reading in all cases was zero.

The COFDM AGC reading ranged from -480 to -500 across the three MUX.

The Pre Viberbi reading on TVNZ was 1.25 e-4 sometimes hiting 8.3 e-5. The 5s was 1.06 e-4 sometimes 9 e-5.

On Mediaworks the Pre V was 1.7 e-4 and 5s 1.7 e-4.

On Kordia the Pre V was 1.2 e-4 sometimes 8 e-5 and the 5s was 1.01 e-4.

What does all this mean?


Glad to see that you probably found the problem and that the whole DTT system wasn't to blame!

The pre viterbi levels show the bit error rates on each mux. I would think that 1.0 e-4 or lower should be OK. (that is one error in 10000, 1.0 e-6 is one error in 1000000 which is better again)




don't mess with me.... i'm the hd insider....

1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:




News »

Trending now »
Hot discussions in our forums right now:

Moment of Truth?
Created by BarTender, last reply by Technofreak on 23-Sep-2014 16:20 (415 replies)
Pages... 26 27 28


Festival of Democracy
Created by gzt, last reply by ubergeeknz on 23-Sep-2014 16:11 (138 replies)
Pages... 8 9 10


GCSB Surveillance Vans?
Created by snowball, last reply by Dratsab on 23-Sep-2014 13:48 (51 replies)
Pages... 2 3 4


Geekzone giveaway: ADATA SSD SP610 256GB and ADATA PV110 Power Bank
Created by freitasm, last reply by loceff13 on 23-Sep-2014 15:28 (45 replies)
Pages... 2 3


How do we get more people out to vote?
Created by nate, last reply by Geektastic on 23-Sep-2014 16:21 (34 replies)
Pages... 2 3


Predict E(l)ection 2014 & win
Created by nakedmolerat, last reply by Technofreak on 23-Sep-2014 09:38 (84 replies)
Pages... 4 5 6


TV for under $1000?
Created by TeaLeaf, last reply by richms on 22-Sep-2014 20:46 (16 replies)
Pages... 2


Looking for online productivity software recommendations
Created by fpsware, last reply by fpsware on 23-Sep-2014 15:04 (15 replies)


Geekzone Live »
Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.